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Search for the correction term to Fermi's golden rule in positron annihilation

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Search for the correction term to Fermi's golden rule in positron annihilation. / Ushioda, R.; Jinnouchi, O.; Ishikawa, K. et al.
In: Progress of Theoretical and Experimental Physics, Vol. 2020, No. 4, 043C01, 22.04.2020.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Ushioda, R, Jinnouchi, O, Ishikawa, K & Sloan, T 2020, 'Search for the correction term to Fermi's golden rule in positron annihilation', Progress of Theoretical and Experimental Physics, vol. 2020, no. 4, 043C01. https://doi.org/10.1093/PTEP/PTAA018

APA

Ushioda, R., Jinnouchi, O., Ishikawa, K., & Sloan, T. (2020). Search for the correction term to Fermi's golden rule in positron annihilation. Progress of Theoretical and Experimental Physics, 2020(4), Article 043C01. https://doi.org/10.1093/PTEP/PTAA018

Vancouver

Ushioda R, Jinnouchi O, Ishikawa K, Sloan T. Search for the correction term to Fermi's golden rule in positron annihilation. Progress of Theoretical and Experimental Physics. 2020 Apr 22;2020(4):043C01. doi: 10.1093/PTEP/PTAA018

Author

Ushioda, R. ; Jinnouchi, O. ; Ishikawa, K. et al. / Search for the correction term to Fermi's golden rule in positron annihilation. In: Progress of Theoretical and Experimental Physics. 2020 ; Vol. 2020, No. 4.

Bibtex

@article{aa884d1092b647d6b8f2670220304549,
title = "Search for the correction term to Fermi's golden rule in positron annihilation",
abstract = "In the positron-electron annihilation process, finite deviations from the standard calculation based on Fermi's golden rule are suggested in recent theoretical work. This paper describes an experimental test of the predictions of this theoretical work by searching for events with two photons from positron annihilation of energy larger than the electron rest mass (511 keV). The positrons came from a 22Na source, tagging the third photon from the spontaneous emission of 22Ne∗ de-exitation to suppress backgrounds. Using the collected sample of 1.06 × 107 positron-electron annihilations, triple coincidence photon events in the signal-enhanced energy regions are examined. The observed number of events in two signal regions, NobsSR1 = 0 and NobsSR2 = 0, are, within the current precision, consistent with the expected number of events, NexpSR1 = 0.86 ± 0.08(stat.)+−1.850.81(syst.) and NexpSR2 = 0.37 ± 0.05(stat.)+−0.800.29(syst.) from Fermi's golden rule, respectively. Based on the P(d) modeling, a 90% CL lower limit on the photon wave packet size is obtained. ",
author = "R. Ushioda and O. Jinnouchi and K. Ishikawa and T. Sloan",
year = "2020",
month = apr,
day = "22",
doi = "10.1093/PTEP/PTAA018",
language = "English",
volume = "2020",
journal = "Progress of Theoretical and Experimental Physics",
issn = "2050-3911",
publisher = "Physical Society of Japan",
number = "4",

}

RIS

TY - JOUR

T1 - Search for the correction term to Fermi's golden rule in positron annihilation

AU - Ushioda, R.

AU - Jinnouchi, O.

AU - Ishikawa, K.

AU - Sloan, T.

PY - 2020/4/22

Y1 - 2020/4/22

N2 - In the positron-electron annihilation process, finite deviations from the standard calculation based on Fermi's golden rule are suggested in recent theoretical work. This paper describes an experimental test of the predictions of this theoretical work by searching for events with two photons from positron annihilation of energy larger than the electron rest mass (511 keV). The positrons came from a 22Na source, tagging the third photon from the spontaneous emission of 22Ne∗ de-exitation to suppress backgrounds. Using the collected sample of 1.06 × 107 positron-electron annihilations, triple coincidence photon events in the signal-enhanced energy regions are examined. The observed number of events in two signal regions, NobsSR1 = 0 and NobsSR2 = 0, are, within the current precision, consistent with the expected number of events, NexpSR1 = 0.86 ± 0.08(stat.)+−1.850.81(syst.) and NexpSR2 = 0.37 ± 0.05(stat.)+−0.800.29(syst.) from Fermi's golden rule, respectively. Based on the P(d) modeling, a 90% CL lower limit on the photon wave packet size is obtained.

AB - In the positron-electron annihilation process, finite deviations from the standard calculation based on Fermi's golden rule are suggested in recent theoretical work. This paper describes an experimental test of the predictions of this theoretical work by searching for events with two photons from positron annihilation of energy larger than the electron rest mass (511 keV). The positrons came from a 22Na source, tagging the third photon from the spontaneous emission of 22Ne∗ de-exitation to suppress backgrounds. Using the collected sample of 1.06 × 107 positron-electron annihilations, triple coincidence photon events in the signal-enhanced energy regions are examined. The observed number of events in two signal regions, NobsSR1 = 0 and NobsSR2 = 0, are, within the current precision, consistent with the expected number of events, NexpSR1 = 0.86 ± 0.08(stat.)+−1.850.81(syst.) and NexpSR2 = 0.37 ± 0.05(stat.)+−0.800.29(syst.) from Fermi's golden rule, respectively. Based on the P(d) modeling, a 90% CL lower limit on the photon wave packet size is obtained.

U2 - 10.1093/PTEP/PTAA018

DO - 10.1093/PTEP/PTAA018

M3 - Journal article

VL - 2020

JO - Progress of Theoretical and Experimental Physics

JF - Progress of Theoretical and Experimental Physics

SN - 2050-3911

IS - 4

M1 - 043C01

ER -